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AERMOD View™ Gaussian Plume Air Dispersion Model - AERMOD

Release Notes

Versions 9.8.x, 9.7, and 9.6.x

Lakes Environmental Software

Tel: (519) 746-5995 – Fax: (519) 746-0793

E-mail: [email protected]

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© 1996-2019 Lakes Environmental Software

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http://www.weblakes.com/

AERMOD View™ Release Notes

2 of 39 Lakes Environmental Software


Web: www.webLakes.com

AERMOD View™ Version 9.8.3

Release Notes

November 22, 2019

New Features

Topic Feature Description

AERMET View Exporting AERSURFACE Data to Google Earth

When exporting project data from AERMET View to Google Earth, the center point for the Sectors, Roughness Radius, and Albedo/Bowen Area layers is now based on the coordinate identified in the AERSURFACE Utility.






AERMET View AERSURFACE - Remember Last Opened Folder for Land Use Files

When selecting Land Use, Canopy, and/or Impervious data files for the 19039 (Draft) version of AERSURFACE, the utility now remembers the last opened folder to save time when adding files from the same directory.

AERMET View AERSURFACE - Selection of Airport Sectors

AERSURFACE Version 19039_DRFT allows users to define each individual surface roughness sector as Airport or Non-Airport. In this update, selecting the Airport Site box on the Surface Roughness tab will now assume all sectors are Airport. Modelers can then uncheck any sector to identify non-airport roughness characteristics.

Output Pathway Enabling Plume Animation Groups by Default

When enabling the Plume Animation option, AERMOD View now automatically enables the first source group in the list (e.g., ALL). It also requires that at least one group be enabled.

Multi-Chemical Run Utility

Optimization for Polyline Source Objects

The Multi-Chemical Run Utility has been optimized to process large polyline source types (Line Area, Line Volume).

Installation Digital Signature Included

Lakes Environmental is digitally signing our commercial product installations for additional security.





Fixed Issues


Source Pathway Source Group Support for RLINE Sources

RLINE sources are now fully supported within Source Groups. The previous release had an issue where incorrect source IDs were assigned to groups for RLINE sources.

Source Pathway Data Tree Updates for Source Groups and Others

Settings which include data trees – such as Source Groups, Urban Groups, and Variables Emissions – were updated to automatically log new group / folder names as soon as the objects are created. This addresses an issue where new groups would be lost depending on the method through which they were created by the user.

Risk Mode Import and Export of Gas & Particle Data

Fixes were applied to Risk Emission Phase Data to allow for improved performance in importing or exporting deposition parameters for each phase.

• Both import and export operations are now handled separately for each phase (Vapor Mercury, Vapor, Particle, Particle-Bound).

• Exported spreadsheets are labeled according to each phase.

The Risk Emission Phase Data List button was also fixed to address a range check error.






Release Notes

October 18, 2019

Fixed Issues


Terrain Processor

Updated Support for Alternate Projections / Datums

Version 9.8.1 updates the Terrain Processor to improve handling of projections and datums not natively supported within the AERMAP executable.

Projects using non-UTM projections or datums unsupported by AERMAP (those other than WGS84/72, NAD83/27, Old Hawaii, or Puerto Rico) will be internally converted to UTM / WGS84 to ensure elevation data are read and imported properly.

These projects will automatically have the Terrain Options switched to read elevations & hill height scales as specified in the project.

Note: The conversion routines are best applied to each model object individually. For this reason, discrete receptors are preferred over gridded receptor networks. Users can still use gridded networks, but a warning will be displayed in this case.





AERMOD View™ Version 9.8

Release Notes

October 8, 2019

New Features


AERMOD Latest Release of US EPA AERMOD Model Available – Dated 19191

The following US EPA Models were released in August 21, 2019 and are incorporated into AERMOD View Version 9.8:

1. AERMOD.EXE is the latest version 19191 (32-Bit Version) 2. AERMOD_19191_X32.EXE – The same as above (32-Bit Version) 3. AERMOD_19191_X64.EXE – 64-Bit Version See the Model Change Bulletin for a list of changes and bug fixes:

https://www3.epa.gov/ttn/scram/models/aermod/aermod_mcb14_v

19191.pdf

AERMOD MPI New Version of Lakes AERMOD MPI 19191 (Parallel Version)

A new version of the Lakes AERMOD MPI for the US EPA Model Version 19191 is now available (AERMOD_MPI_Lakes_19191.exe). Install includes 64-bit and 32-bit versions. You can specify to use this model under the Preferences dialog.

Note: AERMOD_MPI_LAKES_19191.EXE or AERMOD_MPI_LAKES.EXE will run the latest version of the AERMOD model (19191) in parallel mode using up to a maximum of 8 cores.

https://www3.epa.gov/ttn/scram/models/aermod/aermod_mcb14_v19191.pdf

https://www3.epa.gov/ttn/scram/models/aermod/aermod_mcb14_v19191.pdf






AERMET Latest Release of US EPA AERMET Model Available – Dated 19191

On August 21, 2019, the US EPA released the new version of AERMET, dated 19191. Updates in the new version include 5 bug fixes which are described on the model change bulletin:

https://www3.epa.gov/ttn/scram/7thconf/aermod/aermet_mcb9.pdf

Lakes Environmental updated AERMET View to include support for model version 19191.

• AERMET.EXE is the latest version 19191 (32-Bit Version)

• AERMET_19191_X32.EXE – The same as above (32-Bit Version)

• AERMET_19191_X64.EXE – 64-Bit Version

Control Pathway

Gas Deposition Options – ALPHA

The status of the Gas Deposition options was changed under the AERMOD Model Version 19191 from Non-Default to ALPHA. The deposition algorithms will undergo more evaluation before the US EPA can change its status again.

In AERMOD View, the Gas Deposition Options are now available under a new location: Control Pathway – Gas Deposition page. The Non-Default option must be selected first to enable the access to this page.

https://www3.epa.gov/ttn/scram/7thconf/aermod/aermet_mcb9.pdf






Control Pathway

Low Wind Options - ALPHA

The Low Wind Options were moved to a new location (Control Pathway – Low Wind Options screen) and its layout was improved by introducing the Default and User-Specified options.

Control Pathway

New Building Downwash Options - ALPHA

AERMOD Model Version 19191 introduces, under the Control Pathway, two distinct sets of ALPHA building downwash options. These are research grade options made available for testing and evaluation purposes and implemented by EPA’s Office of Research and Development (ORD) and Air & Waste Management Association (AWMA).

These new options require the user to select the Non-Default option first and are available under the Control Pathway – Downwash Options page.






Control Pathway

New Layout for Control Pathway - Non-Default Options

The Model Options section under the Control Pathway – Dispersion Options screen have a new layout as seen in image below.

Source Pathway New Roadway Source Type Introduced – RLINE - BETA

AERMOD Model Version 19191 introduces a new source type “RLINE” to model roadways or similar line-type releases. The algorithms used for this new source type are from the R-LINE model version 1.2 (www.cmascenter.org/r-line).

In AERMOD View, this source is identified with the following toolbar button:

See below more information on the RLINE Source:

1. Non-Default BETA option 2. Must be used with FLAT terrain 3. Has the same parameters as the LINE Source 4. Can be specified in AERMOD View as a line with multiple segments.






Source Pathway METHOD 2 Particle Deposition – ALPHA

The status of the METHOD 2 Particle Deposition option was changed under the AERMOD Model Version 19191 from Non-Default to ALPHA. The deposition algorithms will undergo more evaluation before the US EPA can change its status again.

Source Pathway BUOYANT LINE Source with Urban Option – ALPHA

The BUOYANT LINE Source can be used with the DEFAULT option for Rural dispersion. However, under AERMOD model version 19191, it is a Non-Default ALPHA option if used with the Urban dispersion option (URBANOPT).

Source Pathway PSD Groups (PVMRM) Option – ALPHA

The PSD Groups (PVMRM) option (PSDCREDIT) is a Non-Default ALPHA option under model versions 18081 and 19191. For earlier model versions, this was a BETA option.






BPIP New US EPA BPIP Version Available as DRAFT– Dated 19191_DRFT

On August 21, 2019, the US EPA released a new version of the BPIP PRIME model as a DRAFT (19191_DRFT). This version is to facilitate testing of the ALPHA building downwash options (see item above).

Two executables are available and can be selected from the Preferences dialog:

1) BPIPPRM_19191_DRFT_32.exe (32-bit) 2) BPIPPRM_19191_DRFT_64.exe (64-bit)

See the Model Change Bulletin at:

https://www3.epa.gov/ttn/scram/mcbs/BPIPPRM_MCB_v19191_DRFT.pdf

Note: Please note that version 19191_DRFT is not a replacement for BPIP PRIME version 04274 (BPIPPRM.EXE). This draft version should not be used in a regulatory context.

Buildings Unlimited Number of Building Coordinates to Import

The option to import Buildings from an Excel file (Import | Buildings… menu option) was limited to 256 columns of data. Therefore, building shapes with more than 123 pairs of X, Y coordinates could not be imported.

This new release has no limit on the number of polygon X, Y points for a building that can be imported from an Excel file.

https://www3.epa.gov/ttn/scram/mcbs/BPIPPRM_MCB_v19191_DRFT.pdf






Terrain Processor

Coordinate Conversion for Non-UTM Projections

For projects utilizing the map projections other than UTM, a modification was made to the Terrain Processor which now internally converts all coordinates to UTM. This change was necessary to import correct terrain elevations at all known objects due to the differences in projection tilts at high latitudes.

Note: This modification requires users to enable the “Run AERMOD using the Elevations/Hill Heights specified in your project” option on the Control Pathway | Terrain Options dialog.

AERMAP Updates to the USGS NED Terrain Data Download

Recent changes to USGS data servers have directed download access for NED terrain data to new servers. Lakes Environmental made the necessary modifications to the WebGIS download routines for these files.






AERMOD Run AERMOD Run – Project Status Dialog

The Project Status dialog is now also shown when the user selects the menu option Run | Run AERMOD. This makes the AERMOD Run options more consistent and allows the user the option to Run BPIP prior to AERMOD.

Note: The BPIP Executable, being used for the run, is now also shown in the Project Status dialog.





Fixed Issues

Topic Issue Description

Input File BUOYLINE Source Input File Order

The US EPA updated their AERMOD Implementation Guide to include some additional modeling guidance. One item related to Buoyant Line sources recommends "users always list the BUOYLINE source last in the AERMOD input file" to prevent a bug in how the model handles other sources.

AERMOD View now writes any Buoyant Line Sources (BUOYLINE) after any other type of source.

Note: See section 7.1 of the AERMOD Implementation Guide, for more information about this US EPA AERMOD model bug:

https://www3.epa.gov/ttn/scram/models/aermod/aermod_implementation_guide.pdf

Terrain Processor

AERMAP Freezes During NED 1/3 Processing

Fixed freezing issue related to the processing of NED 1/3 terrain data. This happened in very few cases where tile edges where close to the selected domain edges.

Buildings Application Freezes When Accessing Buildings

In very few cases, AERMOD View was occasionally freezing when attempting to

modify parameters in the Buildings Inputs dialog. This issue has been resolved.








Multi-Chemical Utility

Multi-Chemical Run Fails due to Spaces on Project Path

Projects with spaces on the name and or path failed to run with the Multi-Chemical utility when source IDs were greater than 8 characters. This issue has been fixed.

Multi-Chemical Utility

Multi-Chemical Warning Messages

After successful completion of some Multi-Chemical runs, a warning was issued stating some years were not calculated. This issue has been resolved to remove the erroneous message.

RiskGen Improved Error Handling

In previous releases, cancelling model runs and exiting Batcher caused an error message to be issued as the utility tried to read incomplete output. A standard Warning message is now issued if runs are cancelled prematurely.

AERSURFACE Executable for AERSURFACE Replaced by 32-Bit Version

The US EPA AERSURFACE executable version 19039_DRFT, introduced on AERMET View Version 9.7, was only compatible with 64-Bit Windows operating systems. This executable now can be used in 32-Bit and 64-Bit operating systems.






AERMET View Land Use Viewer Display Fix for 1992 Data

The Land Use Viewer tool displayed incorrect categories when running the

AERSURFACE 19039_DRFT version with 1992 land use data. This issue has been

fixed.





Known Issues


AERMOD 16216r

Receptor Order Bug

There is a bug in the US EPA’s code related to receptor exclusion when calculating PRIME downwash effects. There exists the potential for model results to change based upon the order of receptors in the input file. This bug was resolved with the US EPA AERMOD 18081 model release.

New Project Wizard

No Spaces in Project Name with ISC

The ISCST3 and ISC-PRIME models are included in AERMOD for backwards compatibility purposes. Due to limitations in their code, these models will issue a fatal error if the project name contains spaces or special characters.






Release Notes

June 17, 2019

New Features


AERMET View New AERSURFACE 19039_DRFT Model & AERSURFACE Utility

On February 21, 2019, the US EPA released the new AERSURFACE 19039_DRFT tool. Updates in the new tool include:

• Support for National Land Cover Database (NLCD) 2001, 2006, & 2011 GeoTIFF-format land cover data files which cover CONUS, Hawaii, Alaska, & Puerto Rico.

• Addition of percent Canopy and percent Impervious data files for years corresponding to the selected land cover data.

• Experimental surface roughness calculation methodology (ZOEFF)

• Separation of airport selection by sector for surface roughness calculations.

• Debug output files for data analysis

AERMET View’s AERSURFACE utility includes support for 19039_DRFT in addition to the existing regulatory version (13016). New features include:

• Preview window with Tile Maps functionality for visually identifying surface roughness sectors

• Automated data downloads via of land cover, canopy, and impervious datasets (see note below)

• Reformatted data inputs in easy-to-use tabs

• Import capabilities for handling existing AERSURACE projects

• Added preview of output files directly to the utility for easy review

NOTE: Download of NLCD data via WebGIS is limited to users with a current maintenance agreement.






AERMET View New AERSURFACE 19039_DRFT Model & AERSURFACE Utility (Continued)






AERMET View QA Statistics Spreadsheet for Surface Met Data File (*.SFC)

A Surface File QA button has been added to the Output Files tab in AERMET View. This generates an Excel spreadsheet with quarterly data analysis of missing and calm hours. The data can be used to satisfy regulatory requirements for documenting data quality.

The file includes counts and percentages of missing hours for met parameters including wind, temperature, cloud cover, humidity, pressure, and precipitation.






AERMET View Land Use Creator Updates

Several updates have been applied to the Land Use Creator for building digital land cover data files for use in the AERSURFACE utility. Updates include:

• Addition of NLCD 2001/06/11 GeoTIFF output format. This file uses a 20-category classification system (as compared to the 21-category system used in NLCD 1992).

• Updated WebGIS with new NLCD 2001, NLCD 2006, NLCD 2011, & CORINE (2012) land cover data. Note that newer NLCD data (01/06/11) can be imported to the 1992 output format of the Land Use Creator.






AERMET View Addition of NLCD 2001/06/11 Data to Land Use Viewer

The Land Use Viewer now displays output from the new AERSURFACE 19039_DRFT with NLCD 2001/06/11 land cover categories.

Terrain Processor

Support for Non-US GeoTIFF Terrain Data Files

The Terrain Processor is now able to read and process terrain data files in GeoTIFF format for locations outside the United States. This includes the Canadian Digital Elevation Model (CDEM) data.

Support is handled by setting the Horizontal Datum selection to “Unknown” for all non-USGS NED files. This forces AERMAP to read coordinates in the same datum as that identified for the project (View | Map Projection settings).






Receptor Pathway

Multi-Select Tools for Sensitive Receptors

To improve selection of discrete receptors as Sensitive, multi-select tools have been added to the Discrete Cartesian Receptors settings.

Receptor Pathway

Disable Gridded Receptors from Plant Boundary

Gridded receptors can now be disabled directly from within the Plant Boundary dialog. Application of either function will automatically remove all gridded receptor types.

Note: Discrete receptors can be still removed via the Actions | Remove Plant Receptors menu option.






Receptor Pathway

Expanded Import / Export Options for Discrete Receptors

Support for the Receptor ID and Sensitive designation has been added to the Export to CSV and Import from File functions for Cartesian Discrete Receptors. Sensitive receptors are noted in the CSV file as enabled (1) or disabled (0).

Source Pathway Import Variable Emissions Data from AERMOD Input Files

When importing sources from an existing AERMOD Input File, AERMOD View now imports Variable Emission factors (via the SO EMISFACT keyword).

Source Pathway Multi-Select Variable Emissions Scenarios

Users can now select multiple scenarios in the Variable Emissions settings in order to delete them together instead of one-by-one.






Source Pathway Character Limit to Auto-Generated Source Groups

The AERMOD model limits source groups to no more than 8 characters while source IDs can have up to 12 characters. When using the Auto-Generated Source Groups utility, an issue could appear when naming groups by source ID due to the character restriction. AERMOD View now issues a warning in this situation so users can adjust group names accordingly.

Output Pathway Zero Values Added to Exceedance Count Contour Plot

The contour plot of exceedances generated by AERMOD View after analyzing the Threshold Violation file (MAXIFILE) now includes 0 values at receptors with no exceedances. This produces a smoother contour plot.

Smoothed Exceedance Count Contour Plot






Output Pathway Auto-Processing Percentiles

When the Percentiles functionality is enabled, AERMOD View will now processing this output automatically before the display of any warning dialogs.

Projects Warnings for Invalid Characters

When starting a new project or saving an existing project, AERMOD View will now warn users who attempt to use invalid characters in the project name. These include apostrophes (‘), quotation marks (“), and percent symbols (%).

Project Status Updated Warnings in Details

The messages presented in Details for projects with warnings and potential errors have been updated to reflect all project data.





Fixed Issues


Import Import Sources from Excel

Fixed an issue where AERMOD View was unable to recognize some XLSX files.

Import Buildings from BPIP Input File

An issue prevented AERMOD View from importing buildings from existing BPIP input files if the building IDs contained spaces. This has been resolved.

Control Pathway

ALPHA Keyword Application

The ALPHA keyword was incorrectly written to the model input file for 18081 model runs when the Non-Default options were enabled and the Adjusted Surface Friction Velocity (ADJ_U*) option selected.

Sources Maintain Existing Source Ranges When Removing Individual Sources

In functions that support specification of source ranges (e.g., Source Groups, PSD Groups, In-Stack NO2/NOx Ratios, etc.), ranges will be preserved after removal of the first or last Source ID within the range. Previously, the entire range was removed from the project setup. Modelers are strongly encouraged to validate source range selections.

Sources Buoyant Line Emission Rate

The emission rate label for Buoyant Line sources was updated in the Source List and Multi-Chem Run utility to show the proper g/s label. This change was to the label only as values were processed as g/s in previous versions.

Source Pathway Default Urban Groups Option

The default setting for Urban Groups was restored to the “Single Urban Group ( ALL Sources)” setting.

Source Pathway Hourly Emission File Maker Utility Support for ISC Model

The File Maker utility was updated to fully support ISCST3 & ISC-PRIME projects. The utility now prepares EMI files with two-digit years instead of four-digits and reads meteorological data from the ISC-specific meteorological data file.






Overlays Cartesian Plant Boundary Layer Order

The Cartesian Plant Boundary layer was added as the bottom-most layer in the Overlays Tree View. This has been corrected so the layer is visible by default.

Project Status Resized Long Project Names

Extremely long project names would overrun the Input File and Output File headings on the Project Status window. This has been updated to truncate the file names accordingly.

Multimedia Default Codec

When using the Record Animation option, the default video compression Codec has been reset to the Intel IYUV codec. The previous default (Microsoft Video 1) is not supported by the Windows default media player application which could lead to ‘Can’t play’ errors when attempting to view AERMOD View AVI files.

Batcher Corrected Meteorological Data Error Message

The Bad Format message for meteorological data files that could not be found was corrected to point to the correct files.






Release Notes

September 28, 2018

Fixed Issues


AERMET View Onsite Data Records Limits Increased

To fully support prognostic model (WRF or MM5) output generated by the US EPA MMIF utility, the number of data records per observation period and number of multi-level measurement heights accepted by AERMET View were increased to 50.

AERMET View Project Status Update

Corrected an erroneous message in Project Status that did not recognize an AERSURFACE output file in the Sectors tab without the user first reviewing the tab.

AERMET View Upper Air Estimator

A minor adjustment was made to the code to prevent unexpected shutdown of the Upper Air Estimator in rare cases.






Release Notes

May 30, 2018

New Features


Models Latest Releases of US EPA Models Available

The following US EPA Models were released in April 2018 and are incorporated into AERMOD View & AERMET View Version 9.6:

4. AERMOD Model 18081 5. AERMET Model 18081 6. AERMAP Model 18081

Note: Installation includes both 64-bit (X64) and 32-bit (X32) compiled executables. Select the appropriate version for your operating system.

Models Removal of Outdated Model Executables

The AERMOD model has been in wide use since its 2005 promulgation as a preferred regulatory air dispersion model in the United States. Since that time, there have been over a dozen model releases by the U.S. EPA. Some of these releases contained significant updates to model routines and changes to calculation methodology.

We have removed several outdated model executables from the installation to promote the current state of science while maintaining backwards compatibility for regulatory applications.

The supported models include both EPA and MPI versions of the following:

• AERMOD 12345, 13350, 14134, 15181, 16216r, 18081

• AERMET 12345, 13350, 14134, 15181, 16216, 18081

• AERMAP 18081

• BPIP-PRIME 04274

• AERSURFACE 13016

• AERMINUTE 15272






AERMOD MPI New Version of Lakes AERMOD MPI 18081 (Parallel Version)

A new version of the Lakes AERMOD MPI for the US EPA Model Version 18081 is now available (AERMOD_MPI_Lakes_18081.exe). Install includes 64-bit and 32-bit versions. You can specify to use this model under the Preferences dialog.

Note: AERMOD_MPI_LAKES_18081.EXE or AERMOD_MPI_LAKES.EXE will run the latest version of the AERMOD model (18081) in parallel mode using up to a maximum of 8 cores.

AERMAP MPI New Version of Lakes AERMAP MPI 18081 (Parallel Version)

A new version of the Lakes AERMAP MPI for the US EPA Model Version 18081 is now available (AERMAP_MPI_Lakes_18081.exe). Install includes 64-bit and 32-bit versions. You can specify to use this model under the Preferences dialog.

Note: AERMAP_MPI_LAKES_18081.EXE or AERMAP_MPI_LAKES.EXE will run the latest version of the AERMAP model (18081) in parallel mode using up to a maximum of 8 cores.






Models Operating System Check

To support proper model execution, error checks have been added to ensure users running 32-bit operating systems do not accidentally use 64-bit executables.

Control Pathway

Updated Dispersion Options

The Dispersion Options have been reorganized to support the AERMOD 18081 model changes and maintain backwards compatibility for model versions 16216r and earlier.

The Model Options group heading still confirms which version of the model is selected in Preferences, and options are enabled or disabled according to the model version and regulatory status (Default or Non-Default).






Control Pathway

New ALPHA Model Keyword

The US EPA has added a new ALPHA keyword in AERMOD 18081 to distinguish research / experimental model options (ALPHA) from community-vetted options under consideration for promulgation (BETA).

The ALPHA keyword will be automatically written to the model input file if a user selects an ALPHA option. Current ALPHA options are:

• New option for handling low wind speeds (LOW_WIND)

• Modeling NO2 increment credits with PVMRM (PSDCREDIT)

Note: No BETA options exist in AERMOD 18081.

Control Pathway

New Low Wind Options

The LOWWIND1-3 model options have been replaced with the new LOW_WIND model keyword accessible via the Low Wind Parameters button.

The new keyword allows modification of the Minimum Sigma-V, Minimum Wind Speed, and Maximum Meander Factor to improve model performance in stable, low wind speed conditions.






Control Pathway

No Multi-Year Average When Reporting Maximum Annual Average For Each Met Year

The ‘Report Maximum Annual Average For Each Met Year’ option only produces the individual year results in AERMOD 18081. Previous model versions included the multi-year average values in the model-generated POSTFILE.

Multi-year average concentrations are still available via the annual average Contour Plot file.

Control Pathway

Default Seasonal Categories

A Default button has been added to the Seasonal Categories dialog for Gas Deposition modeling. Default selections are based on the Hemisphere selected in View | Map Projection.






Control Pathway

Removal of NO2 Ambient Ratio Method (ARM)

AERMOD 18081 no longer supports the Ambient Ratio Method (ARM) for NOx to NO2 conversion. Results can be replicated by selecting ARM2 and setting the Minimum and Maximum ratios to the same value.

If importing an existing AERMOD input file containing the ARM option, a warning message will be issued.

Source Pathway

Emissions Units for Odor

When ‘Odor Units’ is selected on the Emission Output Units options, the displayed units for Emission Rate in the Source Release Parameters will now be labeled as OU/S or OU/s-m**2.

Source Pathway

Updated PSD Groups Header

The header of the PSD Source Groups option for PVMRM now reflects the model option’s status as an ALPHA option.






RiskGen Project Management

Project files generated via the RiskGen utility are now stored in a project sub-folder <project_name>.RSK. This provides better organization of project files and makes it easier to find data when needed.

Project Backup RiskGen Files Included

AERMOD View’s integrated project backup utility now includes all files produced via the RiskGen utility in support of modeling analyses for human health risk assessment.

Project Status Variable Emissions Scenario Check

Project Status now issues a warning if sources are not included with a variable emissions scenario.






AERMET View Upper Air Estimator

The Upper Air Estimator utility has been updated for the AERMET 18081 model.

AERMET View New KML Export Objects

When exporting AERMET View project data to Google Earth, all projects now display sectors in accordance with the recommendations of Section 3.1.2 of the U.S. EPA’s AERMOD Implementation Guide. This includes:

• 10km x 10km area for calculating albedo & Bowen ratio

• 1km radius for calculating surface roughness





Fixed Issues


Terrain Processor

Downloading NED Data for Projects with Existing Tiles

NED 1 and NED 1/3 tiles will now be successfully downloaded from WebGIS even if existing tiles are already present in the project folder. Previous versions would issue an error if NED data already existed in the project folder.

Control Pathway

Default Minimum NO2/NOx Ratio for ARM2

The default value for the ARM2 Minimum NO2/NOx Ratio model option has been reset to 0.50 in accordance with regulatory guidance.

Meteorology Pathway

Loading File Information

The Surface Met Data and Profile Met Data groups of the Met Input Data options will complete all of the Start Date, End Date, Version, Calms, and Missing fields when the Surface and/or Profile files are input and the corresponding file exists in the same location.

Receptor Pathway

Flagpole Heights Option

Two issues involving the Flagpole Heights option were resolved:

1. When importing receptors from an AERMOD input file with the Flagpole Heights option enabled, Hill Heights were incorrectly applied to the Flagpole Heights column for discrete receptors.

2. Individual flagpole heights are now applied to onsite receptors.

Reports Sensitive Receptor Summary Report

This report was updated to include all sensitive receptors in the report. The previous release only reported the first four sensitive receptors.






Reports Results Summary Peak Date Update

The Results Summary report was modified to remove any date and hour information from Deposition results. Those values are specific to concentration results only in AERMOD’s contour plot file.

AERMET View Warnings List Updated

When using the “Read Mixing Heights from Onsite Data” option, the application issued an incorrect warning message stating that Upper Air data was missing. This warning no longer appears.

AERMET View AERSURFACE File Option Retained

The “Use AERSURFACE File Instead of Sector & Surface Parameters” option would become disabled if the user left and returned to the Sectors tab. While the model always used the user-specified selection, the selection is now properly retained within the interface.

AERMET View Onsite QA Table Updated

Values on the Onsite Variable Ranges table were corrected to match Table B-4 of the US EPA AERMET user’s guide.

AERMET View Upper Air Estimator Fix

In very rare instances, the Upper Air Estimator encountered an early termination due to solar elevation angle. This has been fixed for AERMET version 16216 and later.

WRPLOT View Wind Classes Table

When supplying new values to the Wind Classes table, the From column would not automatically update when switching units from m/s to knots. This has been fixed.

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